It is systemctl talking. This failure has the same reason of the previous one: your environment has no file server module onboard. Iām fixing this, too 
thank you very much for your help!
If you want to test a new package version, with a new fix this is the latest release
nethserver-ns8-migration-1.0.4-1.34.g4ff326c.ns7.x86_64.rpm
The command to update existing installations should be:
mv -f /etc/wireguard/{wg0,ns8}.conf
yum --enablerepo=nethserver-testing update nethserver-ns8-migration
Whilst, for new installations:
yum --enablerepo=nethserver-testing install nethserver-ns8-migration
Ensure there is no /etc/wireguard/wg0.conf hanging around: new package version changes the name of the Wireguard interface. It now uses interface ns8.